We would be happy to know what the issue is to have it fixed in Firefox 5.
Please respond with more details if you can. Thank you. :-)
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If you still want to downgrade, see here:
* http://releases.mozilla.org/pub/mozilla.org/firefox/releases/latest-4.0/win32/en-US/
* [[installing firefox]]

@shokahoka@q.com, I'm surprised that page worked in earlier versions of Firefox. It uses a script to click on links, which has not worked for a long time as far as I know.
There are at least two add-ons that can take actions on multiple links. I haven't tested either of them, but you could check them out:
[https://addons.mozilla.org/en-US/firefox/addon/multi-links/ Multi Links :: Add-ons for Firefox]
[https://addons.mozilla.org/en-US/firefox/addon/selection-links/ Selection Links :: Add-ons for Firefox]